Undercut tile.



PATENTBD MAY 16, 1905.

W. H. GAMMEYER. UNDERGUT TILE. APPLICATION FILED MAB. 4, 1904.

FIG. 2.

FIG. 3.

PIG-.7.

PIG--6.

Patented May 16, 1905.

PATENT rricE.

WILLIAM H. OAMMEYER, OF BOONTON, NEI/V JERSEY.

UNDERCUT TILE.

SPECIFICATION forming part of Letters Patent No. 789,794, dated May 16,1905.

Application filed March 4, 1904:. Serial No. 196,552.

To all whom it may concern.-

Be it known that I, WVILLIAM H. CAMMEYER, of Boonton, New Jersey, haveinvented a new and useful Improvement in Undercut Tiles, which is fullyset forth in the following specification.

This invention relates to self-locking tiles.

The object of the invention is to provide an undercut mortise or seatupon the back or bottom of the tile intended for interlocking with acorresponding dovetail projection upon the wall or floor of a building,such projection being either one already formed or one made at the timein cement or the like by the tile itself when pressed into place. Theparticular idea here involved is the use of a (metal) blank, as aformer, in producing the under out in the seat.

The invention will be best understood by reference to the accompanyingdrawings, in which- Figure 1 is a perspective of one of the tiles. Figs.2 and 3 are views to illustrate different forms of undercut seats. Fig.4 shows means for forming a tile according to my invention. Fig. 5 is aperspective of a blank. Fig. 6 shows a modification of my tile, and Fig.7 illustrates means for forming the tile shown in Fig. 6.

Referring to Fig. 4:, A represents a mold for receiving the compositionthat is to constitute the tile. B is a rib rising from the .fioor of themold and having its sides vertical or even, coming nearer together atthe top. Viewed from above, the sides of rib B may be either parallel,Fig. 2, or flaring, Fig. 3, and there may be a plurality of transverseribs B. C represents a (metal) blank that in the form shown consists ofa rectangular sheet, having its two sides bend inward and downward, asshown in Fig. 5, and placed astride the rib B. It will be noted thatwhen this blank is bent into shape to act as a former it presents thetwo protruding shoulders c 0, that extend beyond the sides of the rib.Preferably the margin of mold A is a raised knifeedge a.

In use the mold is filled with suitable composition (which term includesglass, porcelain, and, in fact, any material or substance suitable formaking tiles) and pressure applied, as by roller D, whereupon the tileis finished and is readily removed, as by inverting mold A. Theshoulders c 0 form the un' dercuts, as the composition takes its placeand becomes set all around the sides of the former 0 without crushingthese shoulders or entering into the space outlined by them. When theroller D runs over the top of the mold, the knife-edges a cut off anyfin that might otherwise be produced around the upper edge of the tile.At no time during this formation has the tile been interlocked with itsmold, and when the tile is removed the former C comes away with it andremains as a lining for the mortise or seat.

In Fig. 7 stout studs B take the place of the longitudinal rib B in Fig.5, and instead of the rectangular blank C, I employ blanks made intoround caps or cups C, that overhang their studs. The tile is produced inthe mold as before and is shown in Fig. 6, which illustrates undercutholes instead of undercut longitudinal grooves.

In application filed May 3, 1904:, Serial No. 206,225, I have claimed apreferred mold for making the tile.

Of course I do not .limit myself to any particular composition formaking these tiles or to any particular shape of tile or to anyparticular shape of mortise or seat or to any particular material forthe blank. The sides of the blank or former need not extend all the waydown to the floor of the mold, as shown in Fig. I, although this ispreferable.

Having thus described my invention, I claim 1. A tile of suitablecomposition as described, having in its rear face, for engagement with aWall or the like, an undercut seat that carries a lining formed of ablank of different material.

2. A tile having in its rear face,for engagement with a wall or thelike, an undercut seat that carries a lining formed of a metallic blank.

3. A tile having in its rear face, for engagement with a wall or thelike, an undercut mortise lined with sheet metal that does not projectbeyond the tile, as and for the purpose described.

4. A tile carrying a metal blank moldedspecificationinthepreseneepftwosubseribing into its rear face to form anundercut seat. Witnesses.

5. A tile having an undercut hole lined WILLIAM H CAMMEYER with ametallic blank. 5 6. A tile having undercut holes lined with Witnesses:

blanks of a clitferent material. C. A. L. MASSIE,

In testimony whereof I have signed this R. L. SCOTT.

